I just realized something
My lamps are 7-inch ones for a W123, not the correct size for a 190D duhhhh! Oh well.
If you go H4 use standard 55W bulbs, and I recommend using Hella Optilux bulbs, they are tops (I don't endorse PIAA junk!)
For a great selection of lamps and bulbs see Susquehanna Motorsports: http://www.rallylights.com/
DDH

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!